JPH082639B2 - Sheet guide cylinders for front or double sided printing machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a sheet guide cylinder of a front or double-sided printing machine, having the features described in the preamble of claim 1.

[Prior Art] This main sheet guide cylinder is known from Japanese Patent Application Laid-Open No. 62-248643. According to this publication, this guide cylinder is provided as a storage cylinder in front of the inside-out cylinder for inverting the sheet at the trailing edge, and has a segment forming an outer cylinder part on the outer periphery, and has a sheet guide surface. It is equipped with a suction device that guides and flattens the sheet in contact with. The suction device has to be adjusted in position with respect to the gripping device for sheet transport to the size of the sheet to be printed. This adjustment is performed independently of the replacement of the gripper device from front to double-sided printing and must be simple but highly accurate. Therefore, the segment forming the unique barrel is supported on the inner shaft and is displaceable in the circumferential direction with respect to the inner shaft, and can be fixed in an adjusted position on the inner shaft by a clamping device. . The above publication describes a clamping device, in which the segments forming the ends of the outer barrel part have radially inwardly directed sides which are connected to each other by tension rods. , The tension rod is provided in a passage extending in the center of the inner shaft and acts on the outside of the side by a pull gripping device,
The pull gripping device is provided in a notch extending laterally through the shaft. The tension rod grasps the rear of one of the pull gripping devices by its upper end and has a thread at the other end, which can be screwed into an internal thread at the end of the passage in the shaft, In that case, this end is supported on the outside of the other gripping device by a bushing and a spring surrounding the tension rod, so that the tension rod is turned by an external actuating member, thus supporting the sides of the segments together. A spring force can be generated and is fixed to the shaft by a pull gripping device. The support of the sides makes it easier for the segment and the suction device supported on it to be distorted, which causes the sheet guide surfaces of the segment and the suction device to bend, resulting in impaired backing. Furthermore, the installation of a part of the clamping device in the central passage and in the cutout extending at right angles to it reduces the stability of the sheet guide cylinder. In that case, the clamping force directly corresponds to the spring stress of the spring, which has to be considerably strong and therefore requires a large actuating force on the actuating member.
In the case of the known device described above, a gear wheel adapted to drive the sheet guide cylinder is screwed onto the end of the shaft together with a part of the clamping device, so to replace the gear wheel:
The clamping device needs to be disassembled. This clamping device is extremely expensive and does not have any means of guaranteeing clamping action during operation of the machine.

Sheet guide cylinders are likewise known which, instead of the inner shaft, have a cast journal for supporting the cylinder.

DE-A 3401689 discloses a clamping device for the same purpose, in which an integral second hollow shaft is rotatably mounted on a hollow inner shaft of the storage cylinder. Which has a clamp cam structure on the periphery which cooperates with the clamp member, which clamp member supports between the clamp cam and the segment forming the actual barrel, for example the support member of the suction device. Has been done. A third shaft is provided as an adjusting shaft inside the hollow shaft shown in FIG. 2, and the adjusting shaft is connected to the operating member at one end, and the sheet smoothing device is provided at the other end. Gears for turning drive are attached. Three clamp members are provided evenly distributed around the hollow cutout portion of the first shaft, and are provided with slits in the longitudinal direction so as to conform to the inner circumference of the support bushing. , And thus can be pressed radially outwards from the support member, and the second hollow shaft is turned relative to the first shaft, so that the clamping member surrounds the second hollow shaft. It is ridden by the cams and rollers provided on the. The hollow construction of the shaft significantly reduces the stability of the sheet guide cylinder. Since the clamping force of the clamping device acts radially outwardly, the segment of the outer cylinder is widened, and therefore the smoothing device components supported on it are displaced outwards in the central cylinder part, so that When printing, the blurring phenomenon occurs. Since the clamping force depends on the operating force, a large operating force is required to increase the clamping force. This known arrangement is also very expensive, difficult to assemble and has no electrical protection.

Furthermore, a device for axially displaceably supporting a rod in a hollow shaft is known from DE-OS 2708478, in which the turning device of the inside-out cylinder is converted from front to double-sided printing. Is used for.

[Problem to be Solved by the Invention] An object of the present invention is to operate a surface that guides a sheet and, in some cases, a member that supports a smoothing device by a large frictional force that is independent of an operating force without being distorted. A plate of the type mentioned at the outset, which has a clamping device consisting of as few simple components as possible, which can be provided with the components without significantly weakening the inner shaft with the bearing journal. The purpose is to provide a paper guide cylinder.

[Means for Solving the Problem] According to the present invention, this object is achieved by the configuration described in the characterizing part of claim 1.

In the case of such a clamping device, only the sides of the displaceable barrel part or other radially extending components are connected, so that axial and radial deformations do not occur. By providing several friction members that are laminated in a sheet-like manner, the friction force is significantly increased at a given clamping force, so that the parts can be joined by a friction joint with a corresponding degree of certainty. This makes it possible to apply a clamping force independently of the actuating force of a relatively weakened spring group, which spring force is interrelated by a clamping lever supported as a rocking arm or a tilt lever. A corresponding lever is transmitted to one of the two pedestals fixed between the overlapping areas of the mating friction members.

With an increase in the friction surface, this lever ratio further reduces the operating force, and therefore by means of an operating member that can be manually screwed into the tension rod with a screw adjusted based on the operating force in order to loosen the clamping device. It can be easily pressed. Therefore, extremely easy manual operation is a particularly advantageous feature of the invention.

Therefore, since the tension rod that transmits the spring force of the spring group that applies the clamping force can be formed thin, the tension rod can be provided in the hole having a relatively small cross section, and therefore the shaft and the shaft The journal is almost never weakened. Also, the installation of a clamp lever, preferably made of a solid material, in the notch on the side of the shaft or the cast journal makes it possible to make the cross-section of the notch relatively small and further penetrates it. The shaft or journal is not significantly weakened as it is not required.

The end of the tension rod, which emerges from the shaft or the journal on the end face side, and the spring for exerting the clamping force are provided in a bell-shaped housing, in which the bell-shaped housing is attached to one side of the spring. Supported, the other side of the spring is the extension of the tension rod,
For example, it is supported by the flange of the tension rod. The free end of the tension rod has a threaded portion axially movably projecting from the bell-shaped housing, to which a corresponding internal thread of the actuating member, a first part corresponding to the play stroke, and It is possible to screw the actuating member against the bell-shaped housing and screw it into the second part which moves axially against the action of the spring when the tension rod is further turned. The play stroke of the actuating element can be used in a manner known per se to actuate the switching element of the electrical protection device. Here, the electrical protection device means a device that electrically prevents the printing press from being put into operation without the segments of the storage cylinder being reliably clamped by the clamping device.

In a preferred embodiment of the invention, the end-of-movement position of the actuating member is defined by a stop, which at the same time defines a switching travel stroke of the electrical protection device,
In that case, the tension rod is adapted to displace the stopper at the end of the axial movement, which limits the rotation of the operating member when the clamping device is loosened, into its operating position. In that case, it is preferable that the axial overlap of the stoppers at the stopper position acting in the radial direction is smaller than the pitch of the screws capable of moving the operating member on the tension rod. (Claim 9) With such a structure, the play stroke of the operating member corresponds to several revolutions. By providing such a play stroke of several revolutions, the protection switch is turned on when it is securely locked, and the printing press can be put into operation.
Further embodiments of this part of the electrical protection device are described in the dependent claims 10 and 11.

Finally, with the arrangement of the present invention, the bell-shaped housing is
It is formed as a pre-assembled component together with a tension rod to which a spring force is applied in the clamping direction, an operating member, its stopper device and a switching member of an electrical protection device, and is fixed to the end surface of the inner shaft by a screw. The advantages that can be obtained are obtained. Furthermore, it should be mentioned in this connection that the means for operating the clamping device and the means for electrically protecting the clamping device are provided separately from the drive gear and therefore the assembly of the drive gear,
It does not get in the way when you need to perform work such as disassembly or adjustment.

In the case of a sheet guide cylinder having a friction member and a clamping device having a clamping force acting by a spring independent of operating force and a spring independent of operating force and having the above-mentioned configuration, this configuration is arranged on one side. It is enough to do it. However, in some cases it is also possible for such an arrangement to be provided on both sides with means which act independently of each other.

Example Next, an example of the present invention will be described with reference to the drawings.

An embodiment of the inventive sheet guide cylinder having the features of the invention is shown in the drawing.

The sheet guide cylinder shown in this embodiment has a sheet having an inner shaft 1 made entirely of one material and an outer cylinder part having at least one segment 2 which is circumferentially displaceable with respect to the inner shaft 1. Figure 4 illustrates the features of the invention in a paper guide cylinder. Instead of the continuous inner shaft 1 shown, it is also possible for the sheet guide cylinder to be constructed with a body and a journal which is cast into it and which bears the cylinder, and is therefore explained in the following description. Structures are provided in such bearing journals.

A sheet contact surface is formed on the outer surface of the segment 2. Furthermore, the sides of the segment 2 can be provided with suction nozzles or other devices for smoothing the sheets or gripping the sheets. This segment 2
Can be firmly fixed to the inner shaft 1 by means of a clamping device. The inner shaft 1 is supported at both ends on the side wall 4 of the machine frame by means of bearing journals 3 which are made entirely of one material and are formed integrally with the inner shaft 1 and are distributed outside the frame. It can be driven by a gear 5 which is connected to the end face of the inner shaft 1 by means of several screws 6 provided. In order to securely connect the inner shaft 1 and the segment 2 provided on the outer case in a frictional connection,
A number of friction members 7 in the form of a disc clutch are fixed to the surface 8 of the radially extending segment 2 as close as possible to the side wall 4 in a package-like manner, for example by screws 9. A complementary formed package of friction members 10 is fastened, for example by screws 12, to the likewise radially extending surface of a bearing 11 directly connected to the bearing journal 3 or the inner shaft 1, in this case the same. Friction members 7 with a stack of intermediate layers of thickness and friction members 10 with a stack of such intermediate layers also engage each other and overlap in a specific area 13. In the overlapping range 13, the friction member 7 fixed to the segment 2 and the friction member 10 fixed to the support base 11 are axially arranged between the support base 11 and the base 2 of the inner shaft 1 and the support base 14. Can be clamped together and thus increasing the friction surface between the friction members 7 and 10 produces a large frictional force even when the clamping force to clamp is relatively small. The example shows the case of three friction members each in one package, so that there are seven friction surfaces in the overlapping area 13. The friction members 7 and 10 are also formed segmentally in conformity with the shape of the segment 2, so that, as can be seen in FIG. 2, they extend only in a part of the circumference in a side view. The pedestal 11, which in the exemplary embodiment is formed into a ring segment, is fixed to the bearing journal 3 of the inner shaft 1 by means of a screw 15 and is axially supported by a support ring 16 or a similar member.

The clamping device has a clamping lever 17 which is provided in a notch 18 on the side of the inner shaft 1 and which acts as a rocking arm in which a lever arm of different length is provided. The clamp lever 17 is supported on the support 14 near the outer end and faces the surface 8 in the overlapping area 13 of the segment 2.
The inner side of the radial part of is pressed by the pressing block 19, so that the pressing force acts parallel to the axis 20 of the inner shaft 1. The end surface of the tension rod 21 to which a spring force is constantly applied in the clamp direction presses the other end portion of the clamp lever 17 in the direction of the axis 20. The tension rod 21 is provided at the center of a hole 22 provided in parallel with the axis 20 or eccentrically, and the opposite end is the bearing journal 3 of the inner shaft 1.
Has been put out to the outside. The tension rod 21 has a ring flange 23 on the outside of the bearing journal 3, which ring flange 23 has a screw 24 at least at one point.
The screw 24 prevents the tension rod 21 from rotating without interrupting the axial movement of the tension rod 21. Outside the radial flange 23 is provided a spring 25, for example a disc spring, which is supported on one side by the radial flange 23 and on the other side by a screw 24.
And another screw (not shown), which is supported inside the bell-shaped housing 26 fixed to the end surface side of the bearing journal 3. For this purpose, the gear wheel 5 has a central hole into which the bell-shaped housing 26 can be fitted. Since the tension rod 21 is constantly pressed against the inner end of the clamp lever 17 by the spring 25, the spring force is strengthened by the clamp lever 17 and this causes the friction members 7, 10
Transmitted to the friction surface of. As a result, the clamping force between the friction members 7, 10 depends exclusively on the spring force of the spring 25 and not on the operating force. The free end of the tension rod 21 projects through the bottom of the bell-shaped housing 26 to the outside where it is connected to the operating member 27. This embodiment shows a thread on the outer end of the tension rod 21 into which an internal thread of the actuating member 27 cooperating with a device for electrically protecting the clamping device can be screwed. For this purpose, starting from the clamping position, the actuating member 27 is first screwed into the threaded portion of the tension rod 21 in the defined play stroke for actuating the electrical protection device. A switching member 28 is shown as an example, which is fixedly supported on the machine as a swing arm, one end of which is an operating member 27.
Engages in a peripheral groove 29 of the electric switch 30, the other end of which acts on the electric switch 30, in which case the spring 31 exerts a spring force on the switching member 28 in the direction of its pre-operation initial position. There is. Only after the play stroke is the actuating member 27 in contact with the axial rolling bearing 36 on the outside of the bell-shaped housing 26, and thus
Further, when screwed, the tension rod 21 moves axially to the left in the drawing. This movement releases the clamp lever 17 and thus breaks the frictional connection between the friction members 7 and 10. When the operating member 27 is rotated in the opposite direction, first, the spring 25 presses the tension rod 21 against the inner end portion of the clamp lever 17 by the force of the spring 25, and therefore, the play stroke in the initial position of the operating member 27 is reversed. The frictional connection between the friction members 7 and 10 takes place until the switch 30 which can be turned and electrically protects the clamping device is released again by the switching member 28.

The final position of movement of the actuating member 27 is at the same time determined by stops 33a and 33b which are designed to limit the play stroke for the switching of the electrical protection device.
Therefore, the tension rod 21 moves the stopper 33b at the axially moving end that limits the rotational movement when the clamp device is released to the working position thereof. Furthermore, the axial overlap of the stopper 32 acting in the circumferential direction with the stopper 33a or 33b at the stopper position is determined by the free end of the tension rod 21 or the operating member 27.
It is smaller than the pitch of the screw in. A stopper 32 consisting of a cam is provided on the actuating member 27, in which case the cam has two stopper surfaces, one of which acts in different rotational directions, the tension rod 21 or the shaft of the inner shaft 1. , Counterstops 33a and 33b on mechanical parts which are axially displaceable within the bell-shaped housing 26 and have a distance adapted to the play stroke and which are secured to the outer end of the pin 34 so as not to rotate. The inner end of the pin 34 is supported by the radial flange 23 of the tension rod 21. Stopper 32 and stopper
Due to the small overlap with respect to the thread pitch with 33a or 33b and the axial spacing of the latter two stoppers 33a and 33b, an operating member is provided to provide a sufficiently long play stroke for actuating the electrical protection device. The stopper 32 on the 27 can be rotated several times, and if the clamping device is released, the spring 2 that releases the clamping device until the stopper 32 contacts the stopper 33b in the final position.
In order to allow the tension rod 21 to move in the axial direction against the force of 5, the operating member 27 can be turned. For this purpose, the stopper 33b has moved slightly by the pin 34 in the axial direction, starting from the axial movement of the tension rod 21, so that the stopper 33b fits into the rotation circle of the stopper 32. When the operating member 27 is first turned in the opposite direction, the tension rod 21 moves to the right, so that the stopper 33b contacts the bell-shaped housing 26 to the right, assisted by the spring 35, and moves the operating member 27 to the right. The next time it is turned, it will not hit the stopper 32. Only after the play stroke, the stopper 32 comes into contact with the stopper 33a again, and is therefore limited to the other end position of the operating member 27. FIG. 4 shows a contact state with the stopper 33b when the clamp device is released.

Instead of the above-mentioned operating member 27 that can be turned manually,
It is also possible to provide an operating member for the tension rod 21, which is driven by a motor.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG.
FIG. 3 is a side view of the drawing, FIG. 3 is a partial cross-sectional view showing the configuration of an operating device constituting the device shown in FIG. 1 in a state in which the clamp device is closed, and FIG. 4 is a view showing the device shown in FIG. FIG. 5 is a partial sectional view showing the device in an opened state, and FIG. 5 is a sectional view taken along the line VV of FIG. 1 ... Inner shaft, 2 ... Segment, 3 ... Bearing journal, 4 ... Side wall, 5 ... Gear, 6 ... Screw, 7 ... Friction member, 8 ... End surface, 9 ... Screw, 10 ... … Frictional member, 11 …… Support base, 12 …… Screw, 13 …… Overlapping range, 14 …… Support base, 15 …… Screw, 16 …… Support ring, 17 …… Clamp lever, 18 …… Notch , 19 …… Pressing block, 20 …… Axis, 21 …… Tension rod, 22 …… Hole, 23 …… Radial flange, 24 …… Screw, 25 …… Spring, 26 …… Bell-shaped housing, 27 …… Operation Member, 28 …… Switching member, 29 …… Surround groove, 30 …… Switch, 31 …… Spring, 32,33a, 33b …… Stopper, 34 …… Pin, 35 …… Spring, 36 …… Axial rolling bearing .

Claims (13)

[Claims] 1. At least two sheet guide surfaces are provided around the segment of the outer barrel part, the segment being circumferentially displaceable with respect to the inner shaft or the cast barrel journal, and this inner part. The clamping device can be fixed to the shaft or to this journal by means of a clamping device, the clamping device being radially directed and having friction surfaces which can be pressed axially against one another by axially movable tension rods of the inner shaft or journal, to the outer barrel part. A sheet guide cylinder of a front or double-sided printing press, which is provided with a segment of a cylinder and an inner shaft or a journal, in the form of a thin plate, alternately engaged with each other, and segments of the cylinder (2)
And a friction surface is formed on the friction member (7, 10) which is connected to the inner shaft (1) or the journal (3) so as not to rotate, and the friction surface is provided at a right angle to the axial direction of the clamping force and works. With the clamp lever (17) capable of being pushed, it is possible to press between the two supports (11, 14) supported by the inner shaft (1) or the journal (3), in which case the clamp lever ( 17) acts as a shaking arm,
One end of this swinging arm is clamped by a tension rod (21) that prevents the spring from rotating (25).
A sheet guide cylinder of a front or double-sided printing press, which is subjected to force by the spring force of the. 2. A clamp lever (17) is provided in a notch (18) on a side surface of an inner shaft (1), and a tension rod (2) is provided.
1) has a notch (18) in the direction of the axis (20) from the end face side
2. The sheet guide cylinder as claimed in claim 1, which is provided in a hole (22) extending up to. 3. An end of the clamp lever (17), which is loosely fitted in the notch (18), facing outward, has a friction member (7,
In the overlapping range (13) of 10), it acts on the inner side of the flange extending inward in the radial direction of the segment (2) and has a smaller radius than this, and is on the opposite side of the friction surface of the friction members (7, 10). The support shaft (14) in the limiting wall portion of the cutout portion (18) of the inner shaft (1) is supported by
The sheet guide cylinder described. 4. The sheet guide cylinder as claimed in claim 3, wherein the supporting surface of the clamping lever (17) comprises an insert of hardened material. 5. A friction member (7) on one side, on which intermediate layers of the same thickness are stacked, is fixed to an end face (8) of a segment (2) extending in a radial direction with respect to an axis (20). , The friction member (10) on the other side is complementary to the axis (2
Friction member (7,10) fixed to the surface of the inner shaft (1) extending in the radial direction with respect to (0) and in this case engaging each other by clamping between the two supports (11,14).
2. The sheet guide cylinder according to claim 1, wherein a force action path is formed in the overlapping range (13) of the sheet guide cylinder. 6. The tension rod (21) is attached to the inner shaft (1).
With the operating member (27) provided on the end face side of the device, the operating member (27) can be pulled back against the action of the spring (25) loaded in the clamping direction, and the operating member (27) is electrically protected. And it is possible to connect with the tension rod (21) only after an idle stroke that acts axially to move the tension rod (21) in order to switch this protection device (30). And claim 1
The sheet guide cylinder described. 7. A bell-shaped housing (26) having a spring (25) for loading a tension rod (21) in a clamping direction on one side inside a bell-shaped housing (26) fixed to an end face of the inside (1). ), The other side is supported by the tension rod (21) and is axially displaceable by the bell-shaped housing (26), the free end of the outwardly guided tension rod (21) having a thread, In the first part corresponding to the play stroke and subsequently to the second part in which the operating member (27) is supported by the bell-shaped housing (26), the internal screw corresponding to the operating member (27) is attached to the tension rod ( twenty one)
7. The sheet guide cylinder as claimed in claim 6, which can be screwed onto a screw at the free end of the tension rod (26) for moving the. 8. The end position of the movement of the operating member (27) is defined by stoppers (32 and 33a, 33b), which at the same time define the idle stroke of the switching of the electrical protection device (30). In this case, the stopper (33b) that restricts the rotation of the operating member (27) when the tension rod (21) loosens the clamp device is displaced to its operating position at the end of the axial movement of the tension rod (21). The sheet guide cylinder according to claim 7. 9. Stoppers (32 and 33) acting in the radial direction.
9. The sheet guide cylinder according to claim 8, wherein the axial overlap of the a, 33b) at the stopper position is smaller than the pitch of the screws with which the operating member (27) can be screwed into the tension rod (21). 10. Stoppers (32 and 33a, 33b) are provided between a cam provided on an operating member (27) and a tension rod (21) in a moving direction so as to have an interval corresponding to a play stroke therebetween. And two non-rotatable cams provided and axially movable.
The sheet guide cylinder described. 11. Two axially movable cams forming stoppers (33a, 33b) are fixed to the outer end of a pin (34) passed through a bell-shaped housing (26), and the inside thereof. The end of the tension rod (2
11. The sheet guide cylinder according to claim 10, which is axially supported by 1). 12. A bell-shaped housing (26) has therein a
Formed as a pre-assembleable component together with the tension rod (21) with a spring force applied in the clamping direction, the operating member (27), its stopper device, and the switching member (28) of the electrical protection device (30). 11. It can be secured to the end face of the inner shaft (1) by means of a screw (24).
The sheet guide cylinder described. 13. The sheet according to claim 1, wherein the operating member (27) is provided with a nut that can be manually screwed into the screw of the tension rod (21). Guide barrel.